Answer:
No
Explanation:
Some objects gain momentum. 
 
        
                    
             
        
        
        
Answer:
No
Explanation:
The force of tension exerted by the string on the rock acts as centripetal force, so its direction is always towards the centre of the circle.
However, the direction of motion of the rock is always tangential to the circle: this means that the force is always perpendicular to the direction of motion of the rock.
As we know, the work done by a force on an object is

where
F is the magnitude of the force
d is the displacement of the object
 is the angle between the force and the displacement
 is the angle between the force and the displacement
In this situation, F and d are perpendicular, so  , therefore
, therefore  and the work done is zero:
 and the work done is zero:

 
        
             
        
        
        
Answer:

Explanation:
We are given that 
Surface area of membrane=
Thickness of membrane=
Assume that membrane behave like a parallel plate capacitor.
Dielectric constant=5.9
Potential difference between surfaces=85.9 mV
We have to find the charge resides on the outer surface of membrane.
Capacitance between parallel plate capacitor is given by 

Substitute the values then we get 
Capacitance between parallel plate capacitor=

V=


Hence, the charge resides on the outer surface=
 
        
                    
             
        
        
        
Answer : The power absorbed by the bulb is, 0.600 W
Explanation :
As we know that,
Power = Voltage × Current
Given:
Voltage = 3 V
Current = 200 mA = 0.200 A
Conversion used : (1 mA = 0.001 A)
Now put all the given values in the above formula, we get:
Power = Voltage × Current
Power = 3V × 0.200 A
Power = 0.600 W
Thus, the power absorbed by the bulb is, 0.600 W